Classer

class.js

  Object.prototype.hasClass = function(className) {
    return this.className.indexOf(className) !== -1;
  }

  Object.prototype.addClass = function(className) {
    if this.hasClass(className) {
      return false;
    }

    this.className = this.className += ' ' + className;
    return true;
  }

  Object.prototype.removeClass = function(className) {
    if this.hasClass(className) {
      return false;
    }

    this.className = this.className.replace(className, '');
    return true;
  }